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US3289843A
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Apparatus for centrifugal screening
Assignee: Dorr Oliver Inc
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Filing: 1964-03-19
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Granted: 1966-12-06
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Expires: 1984-03-19
Abstract
No abstract record available.
Inventors
- 👤 Nyrop Per
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:43
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/12; B04B3/00; B04B3/04; B04B5/00; B04B5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734635A
Cited
US1569778A
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US2870912A
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US2883054A
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US3011647A
Cited
GB866853A
Cited
US3063981A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |